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Montmorillonite-Organic Complexes - Gas Chromatographic Determination of Energies of Interactions

Published online by Cambridge University Press:  01 July 2024

K. K. Bissada  and
W. D. Johns
K. K. Bissada*
Affiliation:
Department of Earth Sciences, Washington University, St. Louis, MO. 63130
W. D. Johns
Affiliation:
Department of Earth Sciences, Washington University, St. Louis, MO. 63130
*
*Present address: Bellaire Research Laboratories, Texaco Inc., Bellaire, Texas
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Abstract

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Gas-solid chromatographic measurements of interaction energies were made for the systems ethanol and acetone with K-, Na-, Ba-, and Ca-montmorillonites. The results revealed an increased interaction energy in the order

K-mont. < Na-mont. < Ba-mont. < Ca-mont.

Interaction energies ranged from about 14 kcal/mole for K-montmorillonite to about 30 kcal/mole for Ca-montmorillonite. A very good agreement was observed between experimental heats of adsorption values and theoretical values for the electrostatic attractive energy between the respective cations and polar molecules.

These results confirm our earlier suggestions that complex formation takes place through cation-dipole interactions and that the polar molecules solvate the exchange cations in a manner similar to the hydration of cations in aqueous solutions.

Резюме

Резюме

Были выполнены измерения энергий взаимодействия ацетона и этанола с калиевым, натриевым, бариевым и кальциевым монтмориллонитами с помощью метода газовой хромато-графии. Показано что по изменению энергии взаимодействия монтмориллониты образуют ряд: К-монтм. < Na-монтм. < Ва - монтм. < Са-монтм. Энергии взаимодействия составляют от 14 килокал./моль для К-монтмориллонита до со 30 килокал./моль для Са-монтморил-лонита. Экспериментально определенные теплоты адсорбции хорошо согласуются с теоретическими значениями энергии электростатического притяжения между соответ-ствующими катионами и полярными молекулами.

Полученные результаты подтверждают ранее высказанные автором предположения о возникновении комплексов путем катионно-дипольного взаимодействия и о сольватации полярными молекулами обменных катионов таким же путем, как происходит гидратация катионов в водных растворах.

Type
Research Article
Information
Clays and Clay Minerals , Volume 17 , Issue 4 , August 1969 , pp. 197 - 204
Copyright
Copyright © 1969, The Clay Minerals Society

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